When i start a race i try to make sure i do it in one fluid motion, that is, i don't want to be fanning the clutch after the bike moves off the line. First up i engage the bike into 1st gear, then i allow the clutch out to the point where its starting to pull (obviously not enough to make the bike move), when the red lights go out i pick up the revs and SLOWLY let the clutch out, i would rather lose a fraction of a second making sure the bike engages properly rather than waste precious time ''fanning'' the clutch after i have already begun moving. This method has worked very well for me over the years, and almost always get the hole-shot. Hope you can use this advice to your advantage.